Why won't upper ball joint removal socket work?

1973 Dart. I got an upper ball joint removal socket OEM tools brand #24238. It seems too big and won't get a grip on the ball joint. It slips off. I measured the ball joint and it was 1 59/64". The socket is labeled 1 59/64". I measured the socket and it is almost 2". Maybe 1 63/64". Am I doing something wrong or is it that I bought the cheapest socket out there and you get what you pay for?
Wrong socket. Actually there were 3 different sizes but only 2 are made any more and the smaller one fits the 2 smaller sized ball joints.